Realistically, you are going to use a Ghoulbane (quested one) a very long time killing rather weak undead mobs until you can solo a:
https://wiki.project1999.com/Blacken..._Bastard_Sword
At some point when 60, you might luck out with a KC upgrade but it’s going to be a rough fight. Burning clickies. I’d get as many levels from Squallslither as one can…